Step or tread.



F. H. STANWO0D.-

STEP 0R TBEAD. APPLICATION FILED DEO.28.1909.

961,176. Patented June 14,1910. m jig] m m ///0 7) Ira/Mr ANDREW B. GRANAM $0.. PNOYO-LITHOGRAPNERS wrsnmstcn. a. a

FRANK H. STANWOOD, OF BALDWINSVILLE, MASSACHUSETTS.

STEP OR TREAD.

Specification of Letters Patent.

Application filed December 23, 1909.

Patented June 14, 1910. Serial No. 534,633.

To all whom it may concern:

Be itknown that I, FRANK H. STANWOOD, a citizen of the United States, residing in Baldwinsville, in the county of Worcester and State of Massachusetts, have invented a new and useful Improvement in Steps or Treads, of which the following is a specification.

This invention is an improved construction of steps or treads adapted to be used in the approaches to railway and other coaches and vehicles.

The object had in view in the invention has been to increase the anti-slipping qualities of the treads by employing a construction which is as durable and in many respects an improvement upon the constructions now used.

The invention consists in a tread composed of strips of vertically corrugated flat metal positioned on edge, and filling strips of wood or other material arranged between the corrugated metal strips and in close contact therewith so that such filling strips afiord all needed lateral support to the metal strips, said metal and filling strips being secured together by transverse bolts passing through them.

The invention further consists in a tread composed of the corrugated metal strips and filling strips arranged between the metal strips as described, the filling strips being provided with vertical grooves on the faces which are opposed to the metal strips forming seats for the corrugations of the metal strips, and rendering the latter more stable and firm in position.

The invention further consists in a tread composed of alternate parallel corrugated metal strips and filling strips in close contact, when the corrugated metal strips are made, higher than the filling strips so that they take the wear from the filling strips and prevent slipping.

These features of the invention are fully explained below and also illustrated in the accompanying drawing in which latter Figure 1 is a plan of my improved tread or step. Fig. 2 is a transverse section of the same. Fig. 3 is a transverse section of a modified construction. Fig. 4 is a perspective view of a portion of one of the filling strips and Fig. 5 a partial elevation of one of the corrugated metal strips.

In said drawing 6, 6, represent the vertically corrugated metal strips, and 7, 7, the filling strips. These strips are arranged longitudinally of the steps as shown in Fig. 1 with the strips 6 standing on edge, and with a filling strip 7 placed between each pair of strips 6. The strips 7 are grooved vertically as at 8 (see Fig. 4) to form seats for the convex bends 9 of the strips 6, and when assembled as in the main figures the strips are brought into close contact so that the bends 9 enter the grooves 8 and find lateral support therein. The strips 6 are thus braced both forward and back and rendered very firm so that in use they give way but very little to pressure when stepped upon. The metal strips are made to extend upward beyond the filling strips to increase the nonslipping character of the surface of the tread, and to enable the metal strips to sustain the heavy wear.

The series of metal and filling strips are united by transverse bolts 10 passing through them and clamping them together firmly, so that the step becomes solid and firm throughout, and it is then attached to the hangers 11 by which it is supported from the car or other vehicle.

I sometimes form the back part of the step of a single piece 12 of hard wood, placing the corrugated metal and filling strips in front where the most of the wear comes. This construction is shown in Figs. 1 and 2, and is a very desirable one. The series of corrugated metal strips and filling strips may however be extended and form the entire surface of the step, as illustrated in Fig. 3. I prefer to make the filling strips of hard wood, but other material may be used in them if desired.

I claim 1. The step or tread wherein are combined a series of vertically corrugated metal strips placed on edge, a separate filling strip between each pair of such metal strips, and transverse clamping bolts.

2. The step or tread wherein are combined a series of vertically corrugated metal strips placed on edge, a separate filling strip between each pair of such metal strips, and

transverse clamping bolts, the filling strips transverse clamping bolts, the metal strips bleing grooved veritieally to 1form seats for extending slightly above the filling strips. tie corrugations 0 the meta strips. 4

3. The step or tread wherein are combined FRANK STANWVOOD' 5 a series of Vertically corrugated metal strips Witnesses:

placed on edge, a separate filling strip be- OWEN A. HOBAN, tween each pair of such metal strips, and RONALDA DORVAL. 

